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Subject[PATCH v3 1/2] dt-bindings: spi: Add schema for Cadence QSPI Controller driver
Date
From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>

Add dt-bindings documentation for Cadence-QSPI controller to support
spi based flash memories.

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
---
.../devicetree/bindings/spi/cadence,qspi.yaml | 162 +++++++++++++++++++++
1 file changed, 162 insertions(+)
create mode 100644 Documentation/devicetree/bindings/spi/cadence,qspi.yaml

diff --git a/Documentation/devicetree/bindings/spi/cadence,qspi.yaml b/Documentation/devicetree/bindings/spi/cadence,qspi.yaml
new file mode 100644
index 000000000000..7756c34bb453
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/cadence,qspi.yaml
@@ -0,0 +1,162 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/spi/cadence,qspi.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Cadence QSPI Flash Controller support
+
+maintainers:
+ - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
+
+allOf:
+ - $ref: "spi-controller.yaml#"
+
+description: |
+ Add support for the Cadence QSPI controller,This controller is
+ present in the Intel LGM, Altera SoCFPGA and TI SoCs and this driver
+ has been tested On Intel's LGM SoC.
+
+ - compatible : should be one of the following:
+ Generic default - "cdns,qspi-nor".
+ For TI 66AK2G SoC - "ti,k2g-qspi", "cdns,qspi-nor".
+ For TI AM654 SoC - "ti,am654-ospi", "cdns,qspi-nor".
+ For Intel LGM SoC - "intel,lgm-qspi", "cdns,qspi-nor".
+
+properties:
+ compatible:
+ enum:
+ - cadence,qspi
+ - cdns,qspi-nor
+ - ti,k2g-qspi
+ - ti,am654-ospi
+ - intel,lgm-qspi
+
+ reg:
+ description: |
+ Contains two entries, each of which is a tuple consisting of a
+ Physical address and length. The first entry is the address and
+ length of the controller register set. The second entry is the
+ address and length of the QSPI Controller data area.
+
+ interrupts:
+ description:
+ Unit interrupt specifier for the controller interrupt.
+
+ clocks:
+ description:
+ phandle to the Quad SPI clock.
+
+ cdns,fifo-depth:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Size of the data FIFO in words.
+
+ cdns,fifo-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Bus width of the data FIFO in bytes.
+
+ cdns,trigger-address:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ 32-bit indirect AHB trigger address.
+
+ cdns,is-decoded-cs:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Flag to indicate whether decoder is used or not.
+
+ cdns,rclk-en:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Flag to indicate that QSPI return clock is used to latch the read data
+ rather than the QSPI clock. Make sure that QSPI return clock is populated
+ on the board before using this property.
+
+ resets:
+ minItems: 1
+ maxItems: 2
+
+ reset-names:
+ minItems: 1
+ maxItems: 2
+ items:
+ - const: qspi
+ - const: qspi-ocp
+
+# subnode's properties
+patternProperties:
+ "^.*@[0-9a-fA-F]+$":
+ type: object
+ description:
+ flash device uses the subnodes below defined properties.
+
+ cdns,read-delay:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Delay for read capture logic, in clock cycles.
+
+ cdns,tshsl-ns:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Delay in nanoseconds for the length that the master mode chip select
+ outputs are de-asserted between transactions.
+
+ cdns,tsd2d-ns:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Delay in nanoseconds between one chip select being de-activated
+ and the activation of another.
+
+ cdns,tchsh-ns:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Delay in nanoseconds between last bit of current transaction and
+ deasserting the device chip select (qspi_n_ss_out).
+
+ cdns,tslch-ns:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Delay in nanoseconds between setting qspi_n_ss_out low and
+ first bit transfer.
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - cdns,is-decoded-cs
+ - cdns,fifo-depth
+ - cdns,fifo-width
+ - cdns,trigger-address
+ - resets
+ - reset-names
+
+examples:
+ - |
+ qspi: spi@ff705000 {
+ compatible = "cadence,qspi", "cdns,qspi-nor";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0xff705000 0x1000>,
+ <0xffa00000 0x1000>;
+ interrupts = <0 151 4>;
+ clocks = <&qspi_clk>;
+ cdns,is-decoded-cs;
+ cdns,fifo-depth = <128>;
+ cdns,fifo-width = <4>;
+ cdns,trigger-address = <0x00000000>;
+ resets = <&rst QSPI_RESET>, <&rst QSPI_OCP_RESET>;
+ reset-names = "qspi", "qspi-ocp";
+
+ flash0: n25q00@0 {
+ ...
+ cdns,read-delay = <4>;
+ cdns,tshsl-ns = <50>;
+ cdns,tsd2d-ns = <50>;
+ cdns,tchsh-ns = <4>;
+ cdns,tslch-ns = <4>;
+ };
+ };
+
--
2.11.0
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